As an intensification of 4724/stéllō ("send"), 649 (apostéllō) focuses back to the source (the one sending), strongly connecting the sender to the one sent (His mission). This verb is used of closely connecting the Lord (the sender) to the believers He personally commissions – as with John the Baptist (Mk 11:2) and the twelve apostles (Mt 10:5; cf. also with His holy angels, Mk 13:27).

Mark 3:14V-PSA-3SGRK:καὶ ἵνα ἀποστέλλῃ αὐτοὺς κηρύσσεινNAS: so that they would be with Him and that He [could] send them out to preach,KJV: he might send them forth to preach,INT: and that he might send them to preach

Mark 3:31V-AIA-3PGRK:ἔξω στήκοντες ἀπέστειλαν πρὸς αὐτὸνNAS: outside they sent [word] to Him and calledKJV: standing without, sent unto him,INT: outside standing sent to him